Be ultra stable, and go waaaaay faster

Thread.sleep() does not a flake-free test make, eliminate it.
And since we aren't sleeping, go 10x+ faster.

Bug: 38270821
Test: this
Change-Id: I94530edbd740f5901233b92eadc43ed9c18a9bc4
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 3fdd96e..5f3e99f 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -8,5 +8,6 @@
                       tests/tests/text/
                       tests/tests/graphics/
                       tests/tests/transition/
+                      tests/tests/uirendering/
                       tests/tests/view/
                       tests/tests/widget/